Table 2 The density (ρ), and apparent molar volume (\({V_\varphi }\)), of GBP in aqueous Betaine, DES, and betaine octyl ester chloride in 0.01,0.03,0.05 molality concentration under 298 K.

^am_solvent (mol kg⁻¹)
0.0102			0.0306			0.0498
Betaine
^bm_solution (mol kg⁻¹)	10⁻³ ρ (kg cm⁻³)	10⁻⁶ V_φ (m³ mol⁻¹)	^bm_solution (mol kg⁻¹)	10⁻³ ρ (kg cm⁻³)	10⁻⁶ V_φ (m³ mol⁻¹)	^bm_solution (mol kg⁻¹)	10⁻³ ρ (kg cm⁻³)	10⁻⁶ V_φ (m³ mol⁻¹)
0.0000	0.99819	-	0.0000	0.99870	-	0.0000	0.99900	-
0.0010	0.99822	138.747	0.0010	0.99870	141.474	0.001	0.99903	141.193
0.0049	0.99834	140.697	0.0049	0.99881	142.774	0.005	0.99914	143.212
0.0100	0.99850	140.154	0.0099	0.99896	142.115	0.0097	0.99927	143.491
0.0201	0.99880	140.851	0.0204	0.99926	142.372	0.02	0.99957	142.774
0.0293	0.99907	141.21	0.0298	0.99953	142.427	0.0294	0.99983	143.048
DES (Betaine: Urea 1:2)
0.0000	0.99799	-	0.0000	0.99897	-	0.0000	1.00005	-
0.0019	0.99817	140.862	0.0010	0.99901	142.559	0.0010	1.00009	142.356
0.0050	0.99846	142.837	0.0050	0.99917	142.225	0.0050	1.00025	142.379
0.0100	0.99894	142.676	0.0099	0.99936	142.777	0.0099	1.00043	143.470
0.0200	0.99987	143.13	0.0200	0.99975	143.141	0.0193	1.00079	143.504
0.0295	1.00075	143.448	0.0296	1.0001	143.644	0.0298	1.00117	143.911
IL (betaine octyl ester chloride)
0.0000	0.99896	-	0.0000	0.99961	-	0.0000	1.00007	-
0.0010	0.99899	140.271	0.0010	0.99964	140.274	0.0010	1.00010	140.790
0.0050	0.99911	141.349	0.0049	0.99975	142.776	0.0049	1.00021	142.518
0.0099	0.99926	141.155	0.0099	0.99989	142.913	0.0100	1.00034	144.090
0.0198	0.99955	141.527	0.0203	1.00018	143.115	0.0199	1.00062	143.493
0.0301	0.99984	141.905	0.0299	1.00044	143.396	0.0289	1.00085	144.151

The standard uncertainties for molality, temperature and pressure were u (m) = 0.001 mol kg⁻¹, u (T) = 0.2 K, u (P) = 10.5 hPa, respectively with level of confidence 0.95. The standard combined uncertainty for density and apparent molar volume were about, u_c (ρ) = 0.06 × 10⁻³ g cm⁻³ and u_c(V_φ) = 5 × 10⁻⁵m⁵ mol⁻¹ (level of confidence 0.68), respectively. ^aThe molality of the prepared betaine compound in water (solvent). ^bThe molality of the prepared gabapentin in aqueous betaine-based compounds.

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